[#12312] Instructor giving individual deadline extensions: give an easy way to select all those who have not submitted yet

[undermyumbrella1]

Fixes #12312

Outline of Solution

• queries feedback service to get submitted giver set
• updates submit status in Feedback model
  I was also wondering, why is isLoadingAllStudents set to false, right when the feedback session is loaded and before getAllStudentsOfCourse()?

New deadline extension is applied to all instructors and users that have not submitted.

[github-actions]

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[zhaojj2209]

Thank you for working on this!

Some suggestions:

• Use the form-check class for the styling of the checkbox, do check the discussion in [#12313] Instructor sending submission reminders: missing space between checkbox and label #12366 for more details.
• The new checkboxes work, but the "Select All" checkboxes are not updated accordingly (see below screenshot where clicking the "Select all instructors not yet submitted" checkbox causes all instructors to be selected, but the "Select All" checkbox is not ticked). Can we add in logic to update these checkboxes as well when interacting with the new checkboxes?

[undermyumbrella1]

Thank you for the review, I have updated the code to include form-check bootstrap class, and added logic to update 'Select All' checkbox, Thank you!

[zhaojj2209]

LGTM, thanks for the changes!

[nusoss-bot]

Folks, This PR seems to be stalling (no activities for the past 7 days). 🐌 😢
Hope someone can get it to move forward again soon...

[weiquu]

LGTM!